Growing evidence indicates that LSD1 is critical for human tumorigenesis, and its expression is increased in several malignancies – including bladder cancer [3], prostate cancer [4], non-small cell lung cancer [5], breast cancer [6, 7], colon cancer [8], uterine endometrioid adenocarcinoma [9, 10], as well as ovarian serous and mucinous adenocarcinomas [11–14]. The gene discussed is KDM1A; the disease is prostate carcinoma.